Sliding clasp fastener

ABSTRACT

A sliding clasp fastener is provided with a pair of carrier tapes each for mounting thereon a series of discrete fastener elements either of metal or plastics material. The tape has a flat side and a waled side including alternate wales and grooves extending lengthwise of the tape. A filler cord is wrapped or enclosed by the tape with its waled side engaged with the cord.

United States Patent [191 Hasegawa et a1.

[ Aug. 26, 1975 1 SLIDING CLASP FAST ENER [75] Inventors: Akira Hasegawa, Kurobe; Yoshiharu Yamaguchi, Namerikawa; Yoshio Matsuda, N yuzen, all of J apan [73] Assignee: Yoshida Kogyo Kabushiki Kaisha,

Tokyo, Japan [22] Filed: Dec. 27, 1974 [21] Appl. No.: 536,830

[30] Foreign Application Priority Data Dec. 29, 1973 Japan ..49-44l84 [52] US. Cl 24/205.16 R [51] Int. Cl. A44B 19/02 [58] Field of Search 24/205.16 R, 205.16 C

[5 6] References Cited UNITED STATES PATENTS 2,061,073 11/1936 Hendley. 24/205.16 R 3,820,202 6/1974 Takamatsu 24/205.16 R

Primary Examiner-Bernard A. Gelak Attorney, Agent, or Firm-Bucknam and Archer 57 ABSTRACT A sliding clasp fastener is provided with a pair of carrier tapes each for mounting thereon a series of discrete fastener elements either of metal or plastics material. The tape has a flat side and a waled side including alternate wales and grooves extending lengthwise of the tape. A filler cord is wrapped or enclosed by the tape with its waled side engaged with the cord.

3 Claims, 2 Drawing Figures PATENTEUAUBZB L975 FIG.2

SLIDING CLASP FASTENER BACKGROUND OF THE INVENTION This invention relates to improvements in a sliding clasp fastener and more particularly to carrier tapes designed for supporting thereon series of discrete fastener elements.

Many sliding clasp fasteners of the known type have been provided with a pair of carrier tapes of a woven structure each having a bulged or swollen marginal edge portion formed by wrapping a filler cord or core with a woven fabric or a strip of plastic material along one longitudinal edge of the tape, said bulged edge portion being adapted for attachment of fastener elements of metal or plastics to the respective carrier tape. Due to relatively flat and fine surface characteristics of the woven tape or the plastic strip, it was difficult to anchor the fastener elements in place with sufficient security against displacement relative to the tape. Furthermore, the pressure of clamping or bonding as applied when mounting the fastener elements will act immediately upon and deform the bulged tape edge, resulting in the possibility of fastener elements becoming unstable in their fixation to the tape.

SUMMARY OF THE INVENTION With the foregoing deficiencies of the prior-art in view, it is the principal object of this invention to provide new and useful improvements in a sliding clasp fastener wherein a bulged tape edge for attachment of a series of fastener elements is protected against deformation or damage when the fastener elements are clamped thereto, 50 that the fastener elements can be retained in the proper position for extended periods of time.

Briefly stated, the sliding clasp fastener according to the invention comprises a pair of carrier tapes, each of said tapes having a flat face at one side and a waled face at the reverse side including a multiplicity of longitudinally extending alternate wales and grooves, a series of discrete fastener elements mounted on said tape, and a filler cord extending along one longitudinal edge of each of said tapes, said cord being wrapped around the fabric of the tape with the peripheral surface of said cord intimately engaged with said waled face of the tape to form a bulged tape edge adapted for attachment of said fastener elements to the tape, said wales being urged radially towards and biting into said cord, and part of the material of said cord being urged towards and filling said grooves.

The features which are believed to be novel and characteristic of the invention will be pointed out with particularity in the appended claims. The invention itself however will be better understood from the following description taken in connection with the accompanying drawings which illustrate by way of example a preferred embodiment which the invention may assume in practice.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of part of a sliding clasp fastener provided in accordance with the invention;

and

FIG. 2 is a transverse cross-sectional view illustrating a pair of fastener stringers coupled together.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Referring now to FIG. 1 there is shown a length of one of a pair of carrier tapes 10 for a sliding clasp fastener F, which tape has mounted on and along one of its longitudinal edges a series of discrete interlocking fastener elements. The carrier tape 10 has a flat face 1 1 at one side and a waled face 12 at the reverse side including a multiplicity of longitudinally extending alternate wales 12a and grooves 12b such as is produced by the warp-knitting of a fabric. A filler cord 13 is disposed to extend along one longitudinal marginal edge of the tape 10 substantially through the entire length of the same and completely wrapped or enclosed by the fabric of the tape 10 to form a bulged tape edge 14 as seen.

According to the features of the invention, the filler cord 13 is wrapped with its peripheral surface engaged intimately with the waled face 12 of the tape 10 and therefore when the fastener elements 15 are clamped around and to the bulged tape edge 14, the wales 12a projecting from the tape 10 are urged radially towards and bite into the cord 13 and the material 13a of the cord 13 is urged towards and fills the grooves 12b between the wales 12a of the tape 10. This results in a gear-like cross-sectional shape of the cord 13 as shown. It will be noted that the interaction of the waled tape face 12 and the filler cord 13 provides firmness in their mutual engagement and at the same time, sufficient mechanical strength of the bulged tape edge 14 along which the fastener elements 15 are mounted. It will also be noted that the wales 12a and grooves 12b at that portion of the tape 10 which lies immediately adjacent the bulged edge 14 are brought into interlocking engagement with each other by clamping two legs 15a, 15b of each element 15 in the usual manner. This will contribute to stabilization of the bulged tape edge 14.

FIG. 2 shows the two identical fastener stringers coupled together as the coupling heads 15a of the fastener elements 15 on the respective carrier tapes 10 are interengaged by a slider S.

What is claimed is:

1. A sliding clasp fastener comprising a pair of carrier tapes, each of said tapes having a flat face at one side and a waled face at the reverse side including a multiplicity of longitudinally extending alternate wales and grooves, a series of discrete fastener elements mounted on said tape, and a filler cord extending along one longitudinal edge of each of said tapes, said cord being wrapped around by the fabric of the tape with the peripheral surface of said cord intimately engaged with said waled face of the tape to form a bulged tape edge adapted for attachment of said fastener elements to the tape, said wales being urged radially towards and biting into said cord, and part of the material of said cord being urged towards and filling said grooves.

2. A sliding clasp fastener as defined in claim 1 wherein said tape has a warp-knit structure.

3. A sliding clasp fastener as defined in claim 1 wherein the wales and grooves at that portion of the tape which lies immediately adjacent said bulged tape edge are held in interlocking engagement with each other. 

1. A sliding clasp fastener comprising a pair of carrier tapes, each of said tapes having a flat face at one side and a waled face at the reverse side including a multiplicity of longitudinally extending alternate wales and grooves, a series of discrete fastener elements mounted on said tape, and a filler cord extending along one longitudinal edge of each of said tapes, said cord being wrapped around by the fabric of the tape with the peripheral surface of said cord intimately engaged with said waled face of the tape to form a bulged tape edge adapted for attachment of said fastener elements to the tape, said wales being urged radially towards and biting into said cord, and part of the material of said cord being urged towards and filling said grooves.
 2. A sliding clasp fastener as defined in claim 1 wherein said tape has a warp-knit structure.
 3. A sliding clasp fastener as defined in claim 1 wherein the wales and grooves at that portion of the tape which lies immediately adjacent said bulged tape edge are held in interlocking engagement with each other. 